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FILE - In this July 21, 2012 file photo, from left: Tylecia Amos, 14; Shatyra Amos, 15; Michael Walker, 17; and Mykia Walker, 16, carry flowers to lay at a makeshift memorial across the street from the Century Theater parking lot, in Aurora, Colo. Twelve people were killed when a gunman entered an Aurora, Colo., movie theater, released a canister of gas and then opened fire during opening night of the Batman movie "The Dark Knight Rises." James Holmes, a 24-year-old former graduate student at the University of Colorado, has been charged in the deaths. (AP Photo/Barry Gutierrez, File)

FILE - In this July 21, 2012 file photo, from left: Tylecia Amos, 14; Shatyra Amos, 15; Michael Walker, 17; and Mykia Walker, 16, carry flowers to lay at a makeshift memorial across the street from the Century Theater parking lot, in Aurora, Colo. Twelve people were killed when a gunman entered an Aurora, Colo., movie theater, released a canister of gas and then opened fire during opening night of the Batman movie "The Dark Knight Rises." James Holmes, a 24-year-old former graduate student at the University of Colorado, has been charged in the deaths. (AP Photo/Barry Gutierrez, File)